Improvement in combined centers and lathe-dogs



enea sere ANDREW .I TRUXELL, 0F LYNCHBURG, VIRGINIA.

Letters Patent No. 109,079,11atea November s, 1870.

IMPROVEMENT IN COMBINED CENTERS AND LATHE-DOGS.

The Schedule referred to in these Letters Patent and making part Aof the same.

'To all whom it may concern Be it known that I, ANDREW J. TRUXELL, of Lynchbnrg, in the county of Campbell and State of Virginia, hayeinvented a new and useful Combined Center and Lathe-Dog 5 and l do' hereby declare that the following isa full, clear, and exact description thereof, sniicient 4to enable those skilled in the art to which my ine Near the outer end is a hole, through which passes a rod, B, having on one end a right-hand screw-thread, and on the other end a 1eft-hand screw-thread.

In the middleof the 'rod B is a groove, b.

In the outer end of the shank A. is inserted a eenter, C, formed with a ,serew-threaid,A so as to be removable.

The inner end of the center C engages with the groove b, and holds the rod B in place on the shank.

The jaws D have their outer ends curved toward each other, the inner ends being bent at right angles, and turned in opposite directions.

Near the curved ends are holes formed with screwthreads, which engage with the screw-threads on the rod B.

N ear the angles are set-screws E, which pass through the jaws and bear against the shank.

Between the angles and the inner ends are projections F.

The inner end of the shank A is inserted in1the arbor, and the studs F fit in radial slots or grooves in the face-plate, so as to turn with it.

The space between the jaws is increased or diminished by Jturning the rod B to the right or left, and the strain is eqnalized by means of the set-screws E.

lVhat I claim as new, and desire to secure by Letters Patent, is-

'lhe improved device herein described,,consisting of the shank and center A C, studded jaws D, and screws B and E, constructed and arranged as set forth.

Y A. J. TRUXELL.

studs or Vitnesses:

C. H. FITCH, JNO. Summe. 

